Graphite filled PTFE tubing low friction is engineered for motion control systems where stick-slip, high breakaway torque, and static charge accumulation reduce seal life and positional accuracy. Our 10% graphite PTFE tube for reciprocating motion uses uniformly dispersed graphite particles to form a self-lubricating transfer film on mating metal surfaces. This PTFE tube with graphite filler lowers the dynamic coefficient of friction from approximately 0.10 for virgin PTFE to a range of 0.04–0.08, depending on load, shaft speed, and surface finish. As a dedicated 10% graphite PTFE tube supplier, we compound the material in-house and extrude tubes under tight dimensional control to minimize lot-to-lot variation. The result is a consistent low torque PTFE tube graphite filled for valve stems, actuator pistons, quick-connect couplings, linear bearings, and pump shafts. Key performance characteristics include:
When specifying graphite filled PTFE tubing low friction for demanding seal or bushing applications, engineers should evaluate filler dispersion, dimensional stability, and surface finish rather than outside diameter alone. Extruded graphite filled PTFE tubing low friction is available in inside diameters from 2 mm to 150 mm, wall thicknesses from 0.5 mm to 8 mm, and standard lengths of 1,000 mm or 3,000 mm, with cut-to-length options for high-volume assembly. Tight tolerances down to ±0.05 mm on ID and ±0.10 mm on OD reduce secondary machining and improve installation repeatability. The graphite additive increases thermal conductivity to approximately 0.45–0.65 W/m·K, which helps dissipate frictional heat in continuous-duty cycles. The tubing is produced by ram extrusion, not paste extrusion, because the abrasive graphite filler demands a higher-pressure process to avoid porosity and delamination. Each production lot is checked for filler dispersion under 40× magnification, and dimensional reports are supplied with every shipment. Common uses include hydraulic cylinder rod seals, pneumatic valve spools, pump wear rings, and food processing guide bushings where FDA-compliant graphite grades are available. For reciprocating motion, the breakaway torque is typically 30–50% lower than unfilled PTFE, which reduces actuator sizing and energy consumption. The table below summarizes the core material and dimensional data for this product:
| Property | Value / Range | Test Method |
|---|---|---|
| Graphite filler content | 10% ±1% by weight | Internal QC |
| Dynamic friction coefficient (dry, steel) | 0.04–0.08 | ASTM D1894 |
| Static friction coefficient | 0.06–0.10 | ASTM D1894 |
| Density | 2.10–2.15 g/cm³ | ASTM D792 |
| Tensile strength | 18–25 MPa | ASTM D4894 |
| Elongation at break | 180–260% | ASTM D4894 |
| Hardness | 58–62 Shore D | ASTM D2240 |
| Continuous service temperature | -200°C to +260°C | — |
| Thermal conductivity | 0.45–0.65 W/m·K | ASTM E1530 |
| Surface resistivity | 10²–10⁶ Ω/sq | ASTM D257 |
| ID tolerance (2–30 mm) | ±0.05 mm | — |
| OD tolerance (5–40 mm) | ±0.10 mm | — |
